#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<stdio.h>

using namespace std;

void test_vector1()
{
  vector<int> v1;
  chv.push_back(1);
  chv.push_back(2);
  for(auto e : chv)
  {
    cout<<e<<" ";
  }
  cout<<endl;
}

int main()
{
  test_vector1();

  return 0;
}
